List of top Chemistry Questions

If ionisation potential for hydrogen atom is 13.6 eV, then ionisation potential for $He^+$ will be

A1 is more reactive than Fe but A1 is less'-easily corroded than Fe because

Which of the following species has four lone pairs of electrons?

Which of the following noble gas is not present in atmosphere ?

Internal energy and pressure of a gas per unit volume are related as

When is the deviation more in the behaviour of a gas from the ideal gas equation pV = nRT?

The catalyst used in the manufacture of polyethene by Zeigler method is

The osmotic pressure of a solution can be increased by

The number of hydroxyl groups in pyrophosphoric acid is

The solubility of AgCl will be minimum in

When $I_2$ is dissolved in $CCI_4$ the colour that results is

The number of unpaired electrons in $Zn^{2+}$ is

Reduction of 2-butyne with sodium in liquid ammonia gives predominantly

Which one of the following on oxidation gives a ketone?

Which of the following fertilizers has the highest nitrogen percentage ?

When $CuSO_4 $ is electrolysed using platinum electrodes?

What is formed when a primary alcohol undergoes catalytic dehydrogenation?

In the fluorite structure, the coordination number of $ Ca^{2+}$ ion is

Which one of the following has the smallest heat of hydrogenation per mole ?

Equal weights of ethane and hydrogen are mixed in an empty container at $25^\circ$ C. The fraction of the total pressure exerted by hydrogen is

Increasing order of acidic strength among p-methoxy phenol (I), p-methyl phenol (II) and p-nitrophenol (III) is

Electronic configuration of calcium atom can be written as

Elements of which of the following groups will form anions most readily?

The correct value of the gas constant 'R' is close to

$H_3PO_2$ is the molecular formula of an acid of phosphorous. Its name and basicity respectively are